package emp;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class EmpList extends HttpServlet {
	@Override
	protected void service(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html;charset=utf8");
		PrintWriter out = response.getWriter();
		try {
			String sql="select * from t_emp";
			Connection con=DBUtil.openInThread();
			Statement stm=con.createStatement();
			ResultSet rs=stm.executeQuery(sql);
			
			List<Emp> list = new ArrayList<Emp>();
			while(rs.next()){
				Emp e = new Emp();
				e.setId(rs.getInt("id"));
				e.setName(rs.getString("name"));
				e.setSalary(rs.getDouble("salary"));
				e.setAge(rs.getInt("age"));
				list.add(e);
			}
			DBUtil.close(null, stm, rs);
			
			request.setAttribute("emps", list);
			request.getRequestDispatcher("emp.jsp").forward(request, response);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			DBUtil.closeInThread();
		}
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out
				.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the GET method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

}
